Adjustable die



Dec. 20, 1955 PATTERSON 2,727,569

3 ADJUSTABLE DIE Filed June 22, 1 95: :5 Sheets-Sheet 1 Fig.7 (9 (9 30Frederick L. Par/erso n IN V EN TOR.

BY m

Dec. 20, 1955 F. L. PATTERSON 2,727,569

ADJUSTABLE DIE Filed June 22, 1953 3 Sheets-Sheet 2 I I 34 82 I64 I66 85Frederick L Par/arson INVENTOR.

F. 1.. PATTERSON 2,727,569

ADJUSTABLE DIE 3 Sheets-Sheet 3 l as Frederick L. Pafferson INVENTOR.

Dec. 20, 1955' Filed June 22, 1953 United States Patent )fi 2,727,569Patented D'e.- 20, 1955 ice ADJUSTABLE DIE Frederick L. Patterson,Masury, Ohio Application June 22, 1953, Serial'Nd; 363,324 4 Claims. (CL164-15) i rovide from a strip of lamination steel} 7 This applicationisa continuation-impart" of my application Serial No. 752,195,- fil'edJt1ne 3, 1947', now Patent No. 2,647,575; issued-August 4; 1953.

In'the construction of ele'etro-magnet ic devices such as transformersit has long been known that the reluctance of the magnetic path isdecreased it the magnetic flux flows in the direction of the grain ofthe laminated pieces forming the magnetic structure. Alsogit has longbeen known that when steel is elongated by rolling thatthe grain: ofthesteel is in the direction of the rolling; Consequent-1y, it is practicedin this art to cutlaminations for magnetic structures so that the pathof the flux will follow the grain of the laminations: and such construction: is provided even though it is nece'ssa ry tb waste a; materialportion of the steel. to secure orientation of the grain in the fluxpath.

In the construction of transformer lanai-nations it is desirable whenpossible to out the laminations from a strip of lamination steel of the;exact widthofthe lamination to be finished: and to trim the endstof: thelaminations to fit into the" structure-:6 It has: heretofore beencustomary to cut the'strip= into'the su'oces'sive len'gths to providethe" lamination pieces and to trimthe': pieces with: shearing: dies toprovide the necessary endli structureszv Since mosteof the laminations:have the diagonal endface" such construction is not: onlywasteful-iofwma terialt but is: also wasteful of labor in that: the:devices must be handled several: timesxand'r frequently" sheared severaltimes in order} to get the" proper contour.

Iw applicants: above: noted" applicatioma shearing die was: constructedwhich forms the successive ends of? the blanks so'that the rear end ofone lamination and the front end of another lamination aresimultaneously formed by the shearoperationso'thatithe diagonal poitions i ofthe endpieces of: the 'lamin'ations mayl be: overlappedorarrangedim side by side relation-so;thatt the minimum material willbewutilized to produce the maXimum number of laminations. The: presentapplication provides a die structure whichnot only forms the" adjacentendsof two laminations ata sing-le cut -but-eliminatesemostofthe-wasta'geof material. betweenathe two ends so thatthe-- minimumamount ofmateriali will be utilized and a single out provide both' thefr'ont of one laminationand therearof thenextp The diestructureaccording: to the present invention-is constructedof male and femaleparts so arranged that the shear will be provided without much waste of-ma-terial between the adjacent e-nd-s of successive 'laminations.

It isaccordingly an object ofthe invention-to-provide an. improvedsheardie.

It is a further object of. the invention to provide a sh'eardie forsimultaneously forming. the ends of.- adjacent sections withoutwastingmaterialbetween the sections.

Itis a further objectof' the invention'to provide a 2 shear diespecifically constructed to build transformer laminations.

Other objects and many of the attendant advantages of the presentinvention will be apparent from the following detailed description takenin conjunctionwith the accompanying drawing in whichi Figure 1 is a planview of the guide and stop arrangement of a shearing die to feed on anelongated strip of transformer steel to be conformed into transformerIaminat-ions;

Figure 2' is a side elevation of the shear die according to theinvention and shows the shear die in open position;

Figure 3 is a cross section through the die taken substantially on theplane indicated by the line 3"3 of Figure 2 and showing a* bottom planview of the male die;

Figure 4- is a cross section through the die structure takensubstantially on the plane indicated by the line 4'4 of Figure 2 andshowing a top plan view of the female die;

Figure- 5' is an enlargedcr'oss section of the die structure with themale structureindicated by hatched lines and showing' one adjustment ofthe die;-

Figure 6 is a View similar to' Figure 5 and another adjustmentof thedie;

Figure" 7 is a vertical sectional elevation through the die in openposition taken substantially on the longitudina l center lineof the die;and

Figure 8 is a plan view of a: lamination cut from the strip bythe'improve'd die.

In the exemplary embodiment according to the invention af-shearstandis'provided having a forwardguide 10 and a rear guide" and stopmember 12' with lateral guide members" 14 and: 1 6 on the forwa-rd guideblock 10f'orslidably engaging the edge of a strip 18 of rolled showingsteel suitable'for' forming transformer laminations, Liliewis'el sideguides? 20% and 22 areprovid'ed on i the forward guidebloclc- 12 amtasuitable stop g'u'ide T4 is slidabl'y adjustablebetween'the'side:guidesZtFand22as by means of the guide slots 26. Spacebetween the blocksltl and 12 will be occupied by a shear die presentl'yto be described; T'he'finished la'mination pieces may be removedfrornithe" stop' block- 1'2rby an desir'ed meanst The shearingdiecomprisesa bottombase member and a top base member 32"arr'anged'inalignednformati'on with each other,- by means of slide rods'34 and 36which maintain the bases 30' and 32i inproper alignment withleachrother:A main female die 381's mountedon the bottom? basemember. 30 and: a mainmale die" member-40 is mounted on the upper base 32: The: main male and:female die members are' arrangedin longitudinal-relation with respect'tothe center-line42- of the path of travel-of-thestrip 18*and-are arrangedwithwthe apices: 44- of the female die and 46 of the male dieinsubstantial oppositionto each-other; but inspaced-{longitudinalrelation: and offset laterally on oppositeisides ofthe v' shaped die members SB-and 40 provides a relation by which theV-face 48 of the V-shaped die member 38 is opposed IO the v face 50 of'ther V shaped die member 40. The V-faces 48 and--50 beingin paralleloifset relation to eachother; Likewise the V-face 52; of. the V- shapeddie member 38 and they-face 54 of the V-shaped die: member 40 are inparallel ofiiset relation'to ea'ch other.

A first pair: of shear blades 56 and 58 are applied to the opposingefaces 48 and 50 of the V-sh'aped members 38 and 40; The shear blades56"and 581- are' identical in construction and; arev providedwith apluralityfiof apertures' 60: in which are secured suitable fasteningmea'ns such as the bolts 62. The end 64 of the shear blade 56 is of adifferent length than the end 66 and the apertures 60 in the fasteners62 are so arranged that the blade 56 may be mounted in either directionon the V-shaped die member 38 so that it will be extended a greater orlesser degree past the apex 44 thereof. Likewise, the blade 58 has anend 68 identical with the end 64 of the blade 56 and an end 78 identicalwith the end 66 of the blade 56. Likewise, the aperture 60 and thefastener 62 of the blade 58 are so positioned that the blade 58 maylikewise be reversed to produce the different overhang over the apex 46of the die member 40.

Parallel offset mountings of the blades 56 and 58 produce a portion 72which is in shear relation with each other so that the reciprocation ofthe die members 38 and 48 will cause a shearing along this edge.Likewise, it will be noted in Figure 6 that when the blades 56 and 58are reversed the shearing section or portion 74 of a different lengthwill be provided.

A pair of lateral male die members 88 and 82 are provided in oppositionto the die member 38 and particularly to the V-faces 48 and 52 thereof.Likewise, female die members 84 and 86 are provided in opposition to theV-faces 50 and 54 of the die member 40.

A male die member 80 opposed to the V-face 48 is provided with a shearblade 88 and the female die member 86 opposed to the V-face 50 of themale die member 40 is provided with a shear blade 90 which is identicalin shape and construction to the shear blade 88. The blade 88 isprovided with an end extension 92 and an end extension 94 of differentlengths. Likewise, the blade 90 is provided with an end member 96 and anend member 98. The end members 96 and 92 being identical and the endmembers 94 and 98 likewise being identical. It is particularly notedthat the blades 56 and 90 are so mounted that the cutting edges thereofform a continuous straight female cutting edge from end to end of theblades and extending diagonally across the die. Likewise the blades 88and 58 form a continuous male cutting edge which is in shear relationwith the combination blades 56 and 90. Ends 92 and 94 of the blade 88are bevelled to provide an outside recess 100 in the continuity of theblades 88 and 58 and likewise the blade 90 is provided with the ends 96and 98 bevelled to provide the recess 102 in the continuity of theblades 56 and 90.

It will be apparent from an inspection of the die arrangement that byreversing the die members 56 and 58 and simultaneously the die members88 and 90 the amount of the shear between the portions 72 and 70 will bealtered. Likewise, the offset of the end of the dies will be altered asshown in Figures and 6 when the short ends of the members 56 and 58 areoverhanging the apices 44 and 46 an offset indicated at 110 and 112 willbe produced and when the long ends of the blades 56 and 58 areoverhanging the apices 44 and 46 a much wider offset will be produced asshown at 114 and 116.

Shear blades 120 and 122 are mounted on the members 38 and 40,respectively, for the small angle of overlap and the blades 120 and 122are of sufficient width that they abut with and form a square line orcutting edge 124 which is a continuation of the cutting edge of the end64 and a cutting edge 126 which is a continuation of a cutting edge ofthe end 68. When the blades 56, 58, 88 and 90 are reversed, blades 120and 122 are replaced by similar blades 130 and 132 which likewiseprovide cutting edges 134 and 136 which are continuations of the cuttingedges of the ends of the blades 56 and 58.

A shear blade 140 is mounted on the lateral male die 82 and is providedwith a tapered end member 142 which extends into the apex 102 betweenthe die members 56 and 90. Likewise, a blade 144 is mounted on thefemale die member 84 and cooperates with the blade 122 and is providedwith a diagonal point 146 which extends into and fills the apex 100between the blade 58 and the blade 88. When the blades 56, 58, 90 and 88are interchanged the blades 140 and 144 are changed for blades 158 and152 which have tapered end portions 154 to extend into the displacedapex 102 and the blade 152 has a tapered end portion 156 to extend intothe apex 100 between the shear blades 58 and 83.

In order to permit the male die to pass the female die 84 a cuttingblade 160 is placed on the male die member 88 and a cooperating cuttingblade 162 is placed on the female die member 84. The cutting edge of theblade 160 is made continuous with the bevelled back edge of the blade 88and preferably the bevel and the cutting edge of the blade 160 arediametrically transverse to the center line 42 of the direction oftravel of the blank 18.

Likewise the die member 82 is provided with a blade 164 and the femaledie member 86 is provided with a blade 166 with the cutting edge of theblade 166 being a continuation of the bevel of the blade which is alsoperpendicular to the axis of travel of the blank.

When the cutting blades 56, 58, 88 and 90 are reversed the blades and162 are replaced by blades 170 and 172 which are of sufficient width sothat they again meet the bevel of the blade 88 and fill the recessbetween the blades 88 and 58. Likewise, the blade 164 is replaced byblade 174 and the blade 166 by blade 176.

As is well understood in the art, base member 30 carrying the female diemembers 38, 84 and 86is cut out under the end of the path of travel ofthe male dies to provide recesses 180, 182 and 184 so that pieces cutout by the passage of the male die will fall below the path of travel ofthe male die.

In operating the shearing dies to produce the transformer laminationhaving the forward point 192 ofiset from the center line of the blank 18and the rear point 194 offset from the opposite direction from thecenter line in the blank 18 the dies are assembled as shown in Figure 5,the blades 56, 58, 88 and 90 set up to produce the small offset from acenter line 42 and the blank 18 will be fed through the side guides 16and 14 and the end will be cut by the operation of the die after whichthe end of the blank 18 will be projected against the stop 24 afterwhich the dies will again be reciprocated to produce the desired numberof parts 190.

When it is desired to utilize a number of parts having the larger ofisetas shown in Figure 6, the blanks will be fed as before to produce aplurality of laminations 196. Obviously, any number of strips or acontinuous strip 18 may be fed through the dies to produce the desirednumber of laminations 190 or 196 so that the desired size of transformerleg may be constructed.

For purpose of exemplification, the die has been set up to produce twoparticular oflfsets as shown at 110 and 112, and 114 and 116. Obviously,the blades 56, 58, 88, and 90, together with the subsidiary blades couldbe replaced by blades of different size to produce different offsetsbesides the ones shown.

Also, it will be obvious that the present invention provides a shearingdie having reversible parts to produce a dislocation of the offset of alamination blank so that lamination blanks having a desired point offsetcan be readily constructed thereon.

For the purpose of exemplification, a particular embodiment of theinvention has been shown and described according to the best presentunderstanding thereof. However, it will be apparent to those skilled inthe art that changes and modifications may be made and arranged in theconstruction and arrangement of the parts herein without departing fromthe true spirit and purpose of the invention.

What is claimed as new is as follows:

1. For use in a shear press for producing a plurality of transformercore laminations from an elongated strip of transformer steel having awidth corresponding to the width of the finished laminations, saidlaminations having similarly shaped pointed ends spaced inwardly fromthe edges of the strip with the apices of said points being disposed onopposite sides of the longitudinal center line of the lamination and thegrain structure of the lamination being parallel to the longitudinalcenter line of the lamination, and side guides for engaging the sides ofthe steel strips, a waste eliminating shearing die for simultaneouslyforming by shearing the ends of adjacent laminations from the stripcomprising a main V-shaped female die member, a main V-shaped male diemember, said main female and male die members being longitudinallyarranged with respect to the path of travel of said strip, the apices ofsaid female and male die member being disposed in proximity and disposedon opposite sides of the path of travel of said strip, the V-faces ofsaid main die members being in olfset parallel relation, a portion onone face of the female die member being opposed to a portion of one ofthe faces of said male die member, shear blades mounted on said opposedfaces, a portion of said shear blades being in shearing relation to eachother, said blades being reversable to vary the extent of the engagementof said blades, second shear blades on the remaining faces of saidfemale and male die members the thickness of said second blades beingdetermined by the position of said first mentioned blades, a pair oflateral male die members opposed to the faces of said main female diemember, a pair of lateral female die members opposed to the faces ofsaid main male die mem ber, shear blades mounted on said lateral diemembers and cooperating in shearing relation with said first and secondshear blades.

2. For use in a shear press having side guides and stop guides forproducing a plurality of transformer core laminations from an elongatedstrip of transformer steel having a width corresponding to the Width ofthe lamina tion and a grain structure parallel to the longitudinalcenter line of the strip, said laminations having similarly shapedpointed opposite ends, spaced inwardly from the edges of the strip withthe apices of said points disposed on opposite sides of the longitudinalcenter line of the laminations, a waste eliminating shearing die forsimultaneously forming the ends of adjacent laminations, comprising amain V-shaped female die member, a main V-shaped male die member, saidmain die members being longitudinally arranged with respect to the pathof travel of the strip, the apices of said main female and male diemembers being arranged in opposition and disposed on opposite sides ofthe center-line of the path of travel of the strip, one V-face of saidfemale die member being opposed in spaced offset relation to a V-face ofsaid male die member, a first pair of similar shear blades, said bladeshaving securing apertures therein, the opposite ends of said pair ofblades being of different length, a portion of said pair of blades beingin shearing relation, said pair of blades being reversable to vary saidportion, a second pair of blades on said main die members, said secondblade abutting said first pair of blades, a pair of male lateral diemembers spaced from said main female die member, a pair of femalelateral die members spaced from said main male die member, a third pairof similar shear blades, one of said third pair of shear blades being inshearing engagement with said first pair of shear blades, said thirdpair of blades forming a continuous shear edge with said first pair ofblades the ends of said third pair of blades being beveled, thealternate male and female lateral dies carrying beveled bladesinterfitting with said beveled ends of said third pair of blades.

3. For use in a shear press having side guides and stop guides forproducing a plurality of transformer core laminations from an elongatedstrip of transformer steel having a width corresponding to the width ofthe lamination and a grain structure parallel to the longitudinal centerline of the strip, said laminations having similarly shaped pointedopposite ends spaced inwardly from the edges of the strip with theapices of said points disposed on opposite sides of the longitudinalcenter line of the laminations, a waste eliminating shearing die, forsimul taneously forming the ends of adjacent laminations, comprising amain V-shaped female die member, a main V-shaped male die member, saidmain die members being longitudinally arranged with respect to the pathof travel of the strip, the apices of said main female and male diemembers being arranged in opposition and disposed on opposite sides ofthe center line of the path of travel of the strip, one V-face of saidfemale die member being opposed in spaced oflset relation to a V-face ofsaid male die member, a first pair of similar shear blades, said bladeshaving securing apertures therein, means engaging said apertures forsecuring said blades, one of said first pair of blades being secured toone of said opposed faces, the other of said first pair of blades beingsecured to the other of said opposed faces, a portion of said first pairof blades being in cooperating position, said blades being reversible tovary the length of said cooperating portion, a second pair of shearblades said second pair of shear blades being secured to the transverseV-faces of said main die members, said second blades abutting said firstblades and forming a continuous cutting edge therewith, a pair oflateral male die members spaced from the V-faces of said female diemember, a pair of lateral female die members spaced from said main maledie member and from said lateral male die members, a third pair ofsimilar shear blades, said third pair of blades being opposed to saidfirst pair of blades, said third pair of blades forming a continuouscutting edge with said first pair of blades, said third pair of bladesbeing reversible to maintain said continuity when said first pair ofblades are reversed.

4. A waste eliminating shearing die for shearing similar pieces from acontinuous strip comprising a main V-shaped female die member, a mainV-shaped male die member, said main die members being longitudinallyarranged with respect to the path of travel of the strip, the apices ofsaid main female and male die members being arranged in opposition anddisposed on opposite sides of the centerline of the path of travel ofthe strip, one V-face of said female die member being opposed in spacedoffset relation to a V-face of said male die member, a first pair ofsimilar shear blades, said blades having securing apertures therein,means engaging said apertures for securing said blades, one of saidfirst pair of of said first pair No references cited.

